I'm sorry to say but thorofasgard13 and Zero are both wrong. Itachi had A Double MS just like Madara but Itachi didn't have the Eyes to make it a Complete Eternal Mangekyou Sharingan. Thats why he would bleed from his eyes when using his Double MS
I'll Explain with Sasuke Double MS.
if you look at
naruto ch 397 pg 2 you see sasuke with Itachi's MS (Mangekyo Sharingan) and later on the next pg or so madara states that Itachi was some how able to transfer his power (Mangekyo Sharingan) into Sasuke.
In Naruto Ch402 pg 15 you see Sasuke awaken his own MS (Mangekyo Sharingan)
Zero Thats what I mean when I say Itachi and Sasuke had a Double MS(Mangekyo Sharingan)
Not that he had two eyes.
Both Itachi and Sasuke had Imcomplete Eternal Mangekyo Sharingan. They both would Bleed when they would use there Mangekyo Sharingan and were slowing falling into darkness because the used the Mangekyo Sharingan to much. Also thats the only reason they Could Susanoo because they both had a Double MS(Mangekyo Sharingan)
Sasuke now has a complete EMS (Eternal Mangekyo Sharingan) Because Sasuke has Itachi's eyes implanted in him.
Madara had or still has an Eternal Mangekyo Sharingan. Which Means he has a Double Mangekyo Sharingan His and his Brother, But what Madara need to make his MS into an EMS, Madara also has his Brother Eyes implanted in him.
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